The Clark County plant operation has been successful in reducing effluent phosphorus to a level that is considered to be the state-of-the science at the existing plant using a combination of biological and chemical treatment processes in series with good reliability. The plant is almost at capacity and yet has produced effluent far below the discharge limits. The technique of using several different technologies in series can achieve the treatment objective especially when the operation is computer controlled and the system has been designed with a reasonable amount of redundancies to allow for repairs and routine maintenance. Operational costs are reasonable, with life-cycle costs of 5.24/lb and $0.98/lb for phosphorus and nitrogen removal, respectively.